I received the same error message as discussed in this thread. I tried to delete missing values in the treatment variable, as suggested, but I still get the same error message.  See below. Any suggestions? Thanks, Emily

 cem childage (6 12 60) cem_mateduc (#0) urb_rur id_country (#0) if malaria_test8tomiss !=., treatment(malaria_test8tomiss)

Matching Summary:
-----------------
Number of strata: 56
Number of matched strata: 22

             0    1    .
      All  775  404  528
  Matched  626  322  437
Unmatched  149   82   91

             imbalance():  3258  <tmp>[1,1] found where void required
                 <istmt>:     -  function returned error
r(3258);

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